Sony.
Playstation isnt big enough to keep sony moving forward alone and with the continued losses they make it is much more plausible for them to go bankrupt than nintendo. PS would then prob be sold off to another company and their first party sutdios would likely be sold seperately. PS would never really be the same again and depending on who buys them depends on if they have the money to rebuild the PS brand.
Nintendo on the other hand is gaming only "atm". A division which just came off of huge profits and a division that is doing relatively well with the 3DS. WiiU on the other hand isnt doing so hot but it would take them much longer to go out of business than Sony. Nintendo still can turn things around with the right decisions moving forward.
Sony on the other hand will need their other products to bring in much more money which means they can not only rely on PS. Honestly with all the losses they have made it kind of shocks me at the money they can even put into the PS brand. Props for that really. Even if their business as a whole is pretty wretched they do good int he gaming world. Would be sad to see them go if it were to ever come to that.
